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Citation: LIU Shaoqian, FANG Zhengfa, YANG Zhanghong, DONG Heda, HUANG Si. Improvement of Stability Constant Determination of Sulfosalicylic Acid-Copper (Ⅱ) Complex[J]. University Chemistry, ;2018, 33(3): 59-62. doi: 10.3866/PKU.DXHX201709038 shu

Improvement of Stability Constant Determination of Sulfosalicylic Acid-Copper (Ⅱ) Complex

1.
National Demonstration Center for Experimental Chemistry and Chemical Engineering Education, Hunan Normal University, Changsha 410081, P. R. China;
2.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 25 September 2017

A method to improve the determination of composition and stability constant of sulfosalicylic acid-copper(Ⅱ) complex, a common experiment in university laboratory course, was proposed. In this study, a mixed solution of sulfosalicylic acid and sodium hydroxide was prepared in advance. The hexamethylene tetramine-nitric acid buffer solution was used to control the pH, which avoided repeatedly adjustment of the pH with a strong acid and a strong base and simplified the experiment process. At pH 5.60, the measured conditional stability constant was 3.6×10³ and the deduced stability constant was 3.6×10⁹, which was roughly consistent with the reported value (3.3×10⁹).
- Sulfosalicylic acid-copper(II) complex,
- Buffer solution,
- Stability constant
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